7-5
7.3 User Control
7.3.1 Related Ports of I315 and I302 Pin Functions
Port
Pin No.
I/O
Signal name
Function
Remarks
GPI04
I315, M1
I
NENU
EXIT/ENTER switch input
ENTER/Withdraw from OSD
GPI05 I315,
L1 I
DOWN
6
switch input
(
6
)key
GPI06 I315,
G18 I
−
3
switch input
(
3
)key
GPI07 I315,
G19 I +
4
switch input
(
4
)key
GPI0
I302, 15
I
POWER
Soft power switch input
(power)key
7.3.2 Functions
The value of each parameter in the OSD can be adjusted by the tact switch. Whether the switch has
been pressed is identified with the switch input level that is turned “L”.
Each switch input port is pulled up at outside of I302.
Each parameter is stored in the EEPROM, the contents of which are updated as required.
7.4 Control of Definition Converter gm5020 (I315)
7.4.1 Ports related to control
Pin No.
I/O
Signal name
Function
R3
I
IRQ
GmZan1 interrupt signal
P1
O
HCLK
GmZan1 serial clock
P3, P4,
R1, R2
I/O
HDATA
GmZan1 serial data
P2
O
HFS
GmZan1 serial select
7.4.2 Related ports of I315 and I302.
Port
Pin No.
I/O
Signal name
Function
P3.5
17
I
IICCLK
IIC bus clock
P3.4
16
I/O
IICDATA
IIC bus data
7.4.3 Functions
Major function of I315 are as follows:
(1) Expansion of the display screen.
(2) Timing control for various signal types.
(3) Power-supply sequence (LCD panel).
7.5 I
2
C Bus Control
7.5.1 Related Ports of I302 (as 7.4.2)
7.5.2 I
2
C-controlled Functions
The following functional controls are effected by I
2
C.
(1) Control of EEPROM I305 for parameter setting.